Tool to check centrality and alignment of keyways in shafts



Jana W, 15 2,494,352

w. w. ABLETT was; TO CHECK CENTRALITY AND ALIGNMENT OF KEYWAYS IN SHAFTS Filed 24, 1945 I INVENTOR. William H616 V centrality and alignment of keyways in shafts. ened the concave portion will become convex as Patented Jan. 1o, 19so r 2,494,152

UNITED. STATES PATENT oFFlcE -,f} i

TOOL TO CHECK CENTRALITY AND ALIGN- MENT OF KEYWAYS IN SHAFTS William W. Ablett, Detroit, Mich.

Application May 24, 1945, Serial No. 595,619

1 Claim. (01. 33-180) 1 2 e This invention relates to a tool for checking the of the opening 26 and when the screw 32 is tight- An object of the invention is to provide a tool shown in Fig. 3 and tend to more firmly bind the that is simple in its operation but efficient in its flanges 38 on the lower and upper flat surfaces 20 results in checking the relation of the keyway. to o and 22. the shaft. j The body it of the tool I4 is provided with a With this and other objects and advantages in longitudinally extending bore 40 which merges view the invention consists of the novel construcinto a larger internally threaded bore 42. The tion and arrangement of elements described, bores 40 and 42 are adapted to receive the body claimed and illustrated in the accompanying l leveling adjusting screw 44, a portion 46 of which drawing forming a part of this specification in is smooth to conform to the bore 40 and a portion which: 48 of which is externally threaded to be received Fig. 1 is a side elevation of an embodiment of in the threaded bore 42. The screw 44 is prothe invention as applied to a shaft having a keyvided at its outer end with a knurled knob 50 for way therein. easy manipulation thereof.

Fig. 2 is a top plan view of the same. The body I6 of the tool I4 is so made that it will Fig. 3 is a sectional view on the line 3-3 of accommodate shafts lilhavingadifi'erence of one- Fig. 2, and half inch in their diameter.

Fig. 4 is a, sectional view on the line 4-4 of When the tool I4 is to be used the shaft I0 is Fig. 1. placed on a suitable support such as V-blocks or Referring more in detail to the drawing, the angle plates placed on a fiat surface of suitable numeral i0 designates a shaft having a central size. keyway l2 therein. The gauge block 28 is then inserted in the key- The tool I4 for determining the centrality and way l2 which is positioned at the exact top center the alignment of the keyway l2 in the shaft I0 of the shaft ID with relation to the supports. comprises an elongated rectangular body it hav- The knob 34 is then turned clockwise to force ing an upwardly extending arcuate shaped porthe screw 32 into contact with the spring 36 and tion i 8 formed integral with one end thereof. the spring into contact with the block 28, thereby The free end of the portion i8 is formed with flat retaining the block 28 in the keyway l2. lower and upper surfaces 20 and 22 respectively, Then by placing a level A On t pp at S111- and is bevelled at 24 as shown in Fig. 2. face of the body IS the screw 44 is turned clock- The end of the arcuate portion i8 is provided wise by means of the ob 50 un l t e Screw 44 with a vertical square shaped opening 26 which contacts the shaft l0 and levels the body it by is adapted to receive the vertically disposed gauge adjustment thereof. block 28 which is uniform in width and thickness hen by m i g the 15001 I4 130 the Opposite d and smaller in these dimensions than the opening of the keyway l 2 and the opposite side of the shaft 26. The length of the gauge block can be varied l 0 the centrality of the keyway can be tested bedepending upon the depth of the keyways to be cause if the body i6 remains level the keyway l2 tested, and is adjustable vertically within the is in the exact center of the shaft l0. opening 26. With this adjustment shafts having the same The end of the arcuate shaped portion extenddiameter can be checked without further adjusting from the opening 26 to the outer end thereof ment of the tool [4. is provided with an internally threaded horizon- It will be apparent to those skilled in the art tal bore 30 which is adapted to receive the comthat a tool has been provided that will accomplish plementary threaded retaining screw 32 which is the purpose of the invention and that various used to retain the block 28 in position in the openchanges and modifications of the form, proportion ing 26. The screw 32 is provided with a knurled and arrangement of the various parts may be knob 34 to permit easy manipulation thereof. made without departing from the spirit of the To prevent the end of the screw 32 from marinvention or extending beyond the scope of the ring the block 28 a transversely curved concave appended claim. spring 36 having forwardly extending right angled Having thus described the invention, what is flanges 38 is positioned in the opening 26 interclaimed as new and desired to be secured by Letmediate the end of the screw 32 and the block 28. ters Patent is:

The width and length of the concave portion of A tool of the character described comprising, an the spring 36 are the same as the width and length elongated rectangular shaped body having a foro. e 3 ward arcuate shaped portion with fiat lower and upper surfaces on the free end of said arcuate shaped portion, and said portion having a square shaped opening in the forward end thereof in vertical relation to said lower and upper surfaces, a gauge block in said opening, a set screw in the outer edge of the forward end of said arcuate portion at right angles to the opening and engaging the block toretain the block in the opening, a cushioning means in the opening between the inner end of the set screw and the block, a smooth bore in said body extending longitudinally thereof from one end thereof for a portion thereof, a tapped bore in said body of larger diameter than said smooth bore and extending longitudinally of the body from the other end of the body, and communicating with said smooth bore, a body leveling adjusting screw having a smooth portion adapted to enter the smooth bore and a threaded portion adapted to enter the tapped bore and said screw having a knob end whereby said screw may be rotated. when saidtool is usedto checkthe centrality and alignment of, keyways in shafts.

WILLIAM W. ABLETT.

4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 568,501 Striker Sept. 29, 1896 636,098 Arot Oct. 31, 1899 725,411 Compliment et a1. Apr. 14, 1903 1,127,955 Berthold Feb. 9, 1915 1,196,789 Koelpin Sept. 5, 1916 1,554,324 Beeler et a1 Sept. 22, 1925 1,653,048 Kelly Dec. 20, 1927 1,686,318 Gallasch Oct. 2, 1928 1,687,649 Gillett Oct. 16, 1928 2,124,603 Barrett "July 26, 1938 2,125,682 Meluzin Aug. 2, 1938 2,235,321 Krumm Mar. 18, 1941 FOREIGN PATENTS Number Country Date 647,674 Germany l July 9, 1937 OTHER REFERENCES Page HW 405, Popular Science Monthly, Sept. 1943. 

